Perhaps you should try some spelling variations:
"multiple options research : july 2009" » "multiple locations research : july 2009", "multiple positions research : july 2009", "multiple solutions research : july 2009", "multiple actions research : july 2009", "multiple optics research : july 2009", "multiple operations research : july 2009", "multiple options research : july 2008", "multiple options research : july 2007", "multiple options research : july 2019"
"multiple options research : july 2013" » "multiple locations research : july 2013", "multiple positions research : july 2013", "multiple solutions research : july 2013", "multiple actions research : july 2013", "multiple optics research : july 2013", "multiple operations research : july 2013"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("multiple options research : july 2009") OR ("multiple options research : july 2013"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"multiple options research : july 2009\") OR (\"multiple options research : july 2013\"))".
• Removing quotes may allow a broader search: (( multiple options research : july 2009 ) OR ( multiple options research : july 2013 )).
• Adding a wildcard symbol may retrieve word variants: (("multiple options research : july 2009") OR ("multiple options research : july 2013"))*.